Measuring device.



G. P. HBIDE..

MEASURING DEVICE.

APPLICATION FILED JULY 5, 1910.

1,027,418. Patented m 28, 1912.

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MEASURING DEVICE.

APPLICATION FILED JULY 5, 1910. 1

1,027,413, Patented May 28, 1912.

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Specification of Letters Patent. Application filed my a, 1910. "Serial No. 510,255.-

Patented May 28,1912.

Be it known that I, CHRISTEN a citizen of the United States, residing. at Kenosha, in the county of Kenosha and State of Wisconsin, have invented certain new and useful Improvements in Measuring Devices, of which the following is 'a specifis cation. a a

My invention relates to improvements in measuring devices, and more particularly to gages for measuring the pitch diameter of gear wheels.

One of the objects of my invention is to provide a more eificient, convenient, and

accurate means for measuring gear wheels,

Another object of my invention is to 'provideagage whereby the diameter of a ear wheel, on the pitch line, may be determined regardless of the totaloutside. diameter of the wheel. And still another object of my invention is to provide a device that may be permanently calibrated or-set for a given size and which will automatically indicate the correctset measurementor thedegree of variation therefrom.

Other and further objects of my inven-' tion will readily become apparent to persons skilled in the art from a consideration of the specification taken in conjunction with the drawings, wherein- Figure 1 is aside elevation showing the gage applied to a gear wheel having an odd number of teeth; Fig.2 is a similar-view showing the gage applied to a larger gear having an even number of teeth; Fig. 3 is a side elevation showing the gage and a standardizing or calibrating bar for the gage when the gage is set for measuring a gear wheel having an odd number of teeth; Fig. 4; is an enlarged section of one end of the gage frame or yoke; Fig. 5 is a similar view of the opposite, end of the frame or yoke; Fig. 6 is a detail of the screw-threaded stem with an anvil used for a gear with an odd number of teeth, attached; Fig. 7 is aview of said stem, with an anvil used for a 7 number of teeth, attac ed; Fig. 8 is an enlarged view of the standardizing bar shown in Fig. 3; Fig. 9' is a broken away'longitudinal central section ofthe slip nut structure; Fig; 10 is an end view of the said nut closed; Fig. 11 is asimilar view showing.

P; HEIDE,

ear having an even the nut opened; and Figs. 12, 13 and 14 are distance collars.

' In all of the ',views, the same reference characters indicate similar parts. As is well known, the pitchline of a gear wheel is the circle upon which the pitch of the tooth is measured; and it is the cir-- cumference by whichthe diameter of the wheel ismeasured.v The distance between the pitchline on one side of thewheel and the same line ,on the opposite side of the corresponding face of the adjacent tooth,

measured'on an arc of the pitch circle, is

called the pitch of the tooth or circular pitch. The pitch of the tooth comprises the width of the tooth and the space be-' tween the tooth and adjacent tooth. U

In order that gearing should operate noiselessly and efliciently, it is very essential that the accurate pitch diameter shall be preserved. The total diameter of the purpose of measuring and accurately ascer taining the pitch diameter of-a gear wheel of a given total size or ofa given number of teeth. It is also capable of readily indicating the degree of any variation from the desired .or intended pitch diameter.

In Fig. I, I have shown the instrument applied to a gear wheel having an odd number of teeth. It will be observed that the index points to zero, thereby indicating that there is no deviation from the true desired diameter of the gear on the pitch line.

The gage for determining the' itch di-' ameter of the gear consists ofv a yoke, 15, provided at oneend with a head, 16, which is smoothly bored, as at 17, having a face, as at 18, the opposite end of which istaperingly counter-bored, as at 19,

a screw-threaded stem 20 passing freely throughv the bore 17 and containing on one end a head, 21,- having a shoulder 22 and screw-threaded, at 23. Aspring slip-nut engagement with the 'taf red end of the head, 16. The nut'is sf) "1t some distance,

longitudinally, to form outwardly set, yielding, and elasticqscrew-threaded members or jaws, 25'25,= which are threaded on their respective inner curved surfaces, as at.

2626'. The end of the nut, 24, including the jaws, is tapered, as at 27,;for engagement with the tapered surface 19 onthe head 16.'. When the jaws 25 25f are pressed inwardly, as ,shown ln' 1gs. 9 and 10, they make threaded engagement with the threaded stem 20 and a slight turn of the: nut 24 tightens the head or shoulder 22 of the stem 20 against the end surface 18 of the head, thereby to hold the stem in positive and fixed contact and invariable rela. tion with the head 16. The slight turn of the nut24 to the left disengages the tapered 'aws from the tapered head 16 andthe jaws,

eing resilient-"and tending to move outwardly, leave their engagement with the threads of the stem. so that the'nut 24 may be then freely longitudinally and qu ickly moved from its position surrounding the stem 20 without the necessity-of rotating it sufiicient to move it the full length of the stem and thus a slit nut is provided that may quickly and conveniently and positively be associated with the parts and as quickly a rear wall, 33, of the housing 29.

removed when the necessity requires. To

the other end of the frame 15 is secured a' housin pin, 34, which may be used to limit the longltudinal movement of the stem 31-, and for the further purpose of indirectly moving the indicator'hand, or index, 35.- The indicating hand, 35, is pivoted, as at 36, and is provided with a pin 37 against which a lever,

38, is caused. to press. The lever 38 is pivoted, as at 39, and has a forward1y'pro ect-" ing nose 40, which normally presses against the rounded portion of the I pin, 34. A

.spring, 41, one end of which makes'contact with the pin 37, normally maintains the indicating lever. 35 in the position shown in Fig. 5. -When the stem 31 is longitudinally moved a ainst the'resistance 'of'thes'pring 32, the pin .34 moves the lever 38 against the resiliently resisting action of'the s ring 41 and thereby the indicating lever or index 35 is moved overfthe scale 42. The forward end of the stem 31 is tapered as at 43,-v the distance between the opposite front sides at passes freely overthe screw-threaded end of the stem-20, and is adapted to make its end face, as at 44, milst be equal to the distance between adjacent teeth on the pitch line of the gear to be measured, which is about one-half of the true. tooth pitch. The taper 43 is at a'sharper angle to the axis of the stem 31 than the taper of adjacent teeth from the itch line to the end of the addendum 0? the tooth, so that the face portion 44 is just suflicient to bridge the space between adjacent'teeth on the diametrical pitch line. The relationof the taper of the anvil and the tooth is clearly shown in Figs. 1 and 2.

An insertible anvil, 45, similar to the anvil shown in Fig. 5, may be detachably se-.

cured to the stem 20. An advantageous" construction of such detachable anvil is shown involving a flange 45 upon the anvil,

and a collar 46 having internal screwthreads for coaction with the threaded portion 23 ofthe stem 20, and a shoulder'47 for coaction with the flange-45 of the anvil, as shown in Fig. 7. This makes for quick adjustment offthe device for different sized gears by the use of spacing collars to be described. 3

By observing Fig. 2 it will be seen that the. gear, to which the ga e is applied, is

provided with an even num 'er of teeth, and that two like pointed tapering anvils are used, that is to say, anvils'that bridge the spaces between ad acent teeth on the pitch hne. It will be further observed that the index 35 is pointing to zero, -from which fact the operator ascertains thetrue pitch diameter of the gear. If the diameter on the'pitch line were smaller the anvils43 and 45 would'approach nearer to ether, the

stem 31 being pressed by the sprm'g, 32, so that the spring, 41, would move the hand or. pointer. 35 several .degrees to the right of the zeromark indicating that thediameter is to'that extent scant. I If the gear were of larger diameter on the pitch line, the anvils 43 and 45 would not-approach so closely together and the stem- 31 would thereby be pressed farther into the housing, 29, agains the resistance of the compression spring. 32,

and the pin 34 would move the lever 38 in such a direction that the indicating lever 35 or index 35"would be caused to move to the left of the zero several degrees, indicating excessive diameter of the gear on the pitch line, and thus it will be seen that the pitch diameter of the gear may be readily ascertained and the extent ofvariation visibly indicated. When a gear wheel having an odd. number of teeth is to be measured, the anvil 48, which bridges one tooth, the ends of the diverging-surface being equal to the width of the tooth on the pitch diameter, is used in place of the anvil 45, as clearly shown in Fig. 1. I bars, 50 are used for the purpose of testing the gage from time to time, as shown in Fig. 3, t at its true integrity may be preserved.

When the device is to be set for gears of diflerent diameters, spacin collars, 51, 52, and 53, such as shownin igs. 12, 13 and 14 of which there may be any desired number, are used in connection with the gage, each said spacing collar providing suitable. threaded portions at its ends for engagementrespectively with. the thr'eads23 of stem 20 and with a 'joint member 54, which is provided with the usual exterior threads upon each side of the central knurled portion. Thus, the spacing collars and the joint member 54 constitute an extension means providing at each end threaded portions for engagement between the threaded portions of the stem 20 andithe anvil 45, which latter normally are adapted to engage when no extension means is necessary; In Fig. 1, the longer collar is used for the smaller gear, in Fig. 2 a smaller collar is used with the larger gear, and in like manner collar 53 is intended for use with a still larger gear.

The device is especially intendedvfor use.

to test each gear of a large number of intended similar diameter, and when it is to be used for gear wheels materially difiering in diameter, a spacing collar, longer or shorter as the case may he, must be substi-v tuted for the one previously used. Each spacmg collar may have its respective-diametrical pltch impressed in its surface to indicate that it is to be used with the gage for indicating the corresponding pitch diameter.

While I have herein described in some detail a articular embodiment of my invention 1t will beapparent to persons skilled in the art that numerous changes might be made in-the specific details of construction shown without departure from the 'slidable anvil above said nose, a roundheaded pin extending from one side of the anvil to engage said nose and move the op crating lever and throu h it the indicating hand when the anvil 1s slid backward] a spring yieldingly holding the anvil 1n forwardmost position, and a spring yieldingly holding the indicating hand. and through it the operating lever in forward- ,most position.

2. In a gage formeasuring the pitch diameter of gears, a yoke, suitably shaped .anvils upon opposite endsof said yoke, one

thereof being stationary and the other slidable toward and fromv said stationary anvil, means for indicating the extent of the sliding moverfient of said slidable' anvil, said anvil providing in its rear end a central bore, a sprlng in said bore normally mamtammg said anvil m posltionnearest said stationary-anvil, a pin projecting laterally from the anvil, a set screw in said central bore for maintaining said pin in position, and means associated with said pin for operating said indicating means. I

In testimony whereof I hereunto set my hand in the presenceof'two witnesses. OHRISTEN P. HEIDE.

In the presence "of Fnnnnmox Punnm, M. P. Wm'rmm. 

